RE: Patents8 May 2019 23:56
There are no beans to spill as there is no improvement in overall efficiency. As you mentioned, two engines make the most sense as to why the power output doubled.
But if you have to double the power input, then no overall gain.
Also, we still do not have an full size specification, L x W x H.
if JG could post the original dimensions and the present ones, that would answer some questions.
Oh, and again no patent for a Stirling Engine only for some minor components.